EP2530847A1 - Verfahren und vorrichtung zur zum erhalten von kanalinformationen - Google Patents

Verfahren und vorrichtung zur zum erhalten von kanalinformationen Download PDF

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Publication number
EP2530847A1
EP2530847A1 EP10850576A EP10850576A EP2530847A1 EP 2530847 A1 EP2530847 A1 EP 2530847A1 EP 10850576 A EP10850576 A EP 10850576A EP 10850576 A EP10850576 A EP 10850576A EP 2530847 A1 EP2530847 A1 EP 2530847A1
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Prior art keywords
information
pmi
channel
base station
user equipment
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EP10850576A
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English (en)
French (fr)
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EP2530847B1 (de
EP2530847A4 (de
Inventor
Yijian Chen
Jun Xu
Yu Ngok Li
Junfeng Zhang
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0645—Variable feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0031—Multiple signaling transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891—Spatial equalizers
    • H04L25/03898—Spatial equalizers codebook-based design
    • H04L25/0391—Spatial equalizers codebook-based design construction details of matrices
    • H04L25/03923—Spatial equalizers codebook-based design construction details of matrices according to the rank
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891—Spatial equalizers
    • H04L25/03949—Spatial equalizers equalizer selection or adaptation based on feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03777—Arrangements for removing intersymbol interference characterised by the signalling
    • H04L2025/03802—Signalling on the reverse channel
    • H04L2025/03808—Transmission of equaliser coefficients

Definitions

  • the present invention relates to a field of communication, and more particularly, to a method and device for acquiring the channel information.
  • both transmitter-side and receiver-side use multiple antennas to acquire a higher rate by way of spatial multiplexing.
  • an improved technology in which the receiver-side feeds back the channel information to the transmitter-side and the transmitter-side uses transmitting precoding technology according to the acquired channel information, can largely improve the transmission performance.
  • SU-MIMO Single-User Multi-input Multi-output
  • MU-MIMO Multi-Users Multi-input Multi-output
  • the feedback of channel information is mainly to utilize a relatively simple feedback method of a single codebook, and the performance of transmitting precoding technology of MIMO depends more on feedback accuracy of the codebook therein.
  • a transmitter-side and a receiver-side jointly save or generate the codebook R (same in both transmitter-side and receiver-side) in real time.
  • the receiver-side selects one code word F ⁇ that best matches the channel realization H from the codebook space R according to certain principles, and feeds back the sequence number i (code word sequence number) of the code word F ⁇ to the transmitter-side.
  • the code word sequence number is called codebook Precoding Matrix Indicator (or simply, PMI).
  • the transmitter-side seeks out the corresponding precoding code word F ⁇ according to this sequence number i , thereby acquiring corresponding channel information, and F ⁇ indicates characteristic vector information of the channel.
  • the codebook space R can be further divided into codebooks corresponding to a plurality of Ranks, and each Rank corresponds to a plurality of code words for quantizing the precoding matrix composed of characteristic vectors under the Rank. Since the Rank of a channel is equal to the number of non-zero characteristic vectors, the number of columns of code words normally is N when the Rank is N. Therefore, the code book space R can be divided into a plurality of sub-codebooks according to different Ranks, as shown in Table 1.
  • Table 2 An illustration of a codebook of downlink 4 transmitting antennas of LTE Codebook Index u n
  • W n I - 2 ⁇ u n ⁇ u n H / u n H ⁇ u n
  • I is a unit matrix
  • W k J represents jth column of vector of matrix W k
  • W k J 1 J 2 J n represents a matrix composed of columns j 1 , j 2 ,...,j n of matrix W k
  • u n H represents a conjugate transpose matrix of u n ; wherein n denotes the sequence number with a value from 0 to 15.
  • LTE-Advanced Long Term Evolution
  • a minimum feedback unit of channel information is a subband, and one subband is composed of several Resource Blocks (RB), and each RB is composed of a plurality of Resource Elements (RE).
  • RE is a minimum unit of time-frequency resource in LTE, and a resource representation method of LTE is still used in LTE-A.
  • a user equipment feeds back one first Precoding Matrix Indicator (PMI1) information, and a base station seeks out a corresponding code word WPMI1 in codebook C1 according to PMI1; the UE also feeds back other one or more Precoding Matrix Indicator (PMI) information that are represented as PMI2 to PMIn (respectively called second Precoding Matrix Indicator information, ..., nth Precoding Matrix Indicator information); the base station seeks out the corresponding code words WPMI2 to WPMIn from the corresponding codebooks, and constructs one matrix by using a function relationship F(WPMII, WPMI2, ..., WPMIn) to indicate the channel information of a subband.
  • PMI1 Precoding Matrix Indicator
  • PMI2 Precoding Matrix Indicator
  • the channel information can be represented by a plurality of function relationships such as product or Kronecker product (its operator is represented by ⁇ ) and the like: WPMI ⁇ 1 O O WPMI ⁇ 1 ⁇ WPMI ⁇ 2 or WPMI1 ⁇ WPMI2, WPMI2 X WPMI1 and the similar function relationships.
  • Feedbacks of a plurality of PMI can be used to respectively configure feedback periods of various PMI, thereby utilizing the feedback resource effectively, and it can also improve feedback precision effectively, without needing to design one single codebook having a large number of code words, and this method reduces the complexity of design of codebook.
  • the present invention provides a method and device for acquiring channel information, to solve a technical problem in the related art that the channel information cannot be fed back flexibly according to requirements.
  • the present invention provides a method for acquiring channel information, and the method includes:
  • the step of the user equipment determining the quantity of Precoding Matrix Indicator (PMI) information required to be fed back to a base station according to ⁇ comprises: when ⁇ is greater than or equal to N0, the user equipment determines that the quantity of the PMI information is m; when ⁇ is less than N0, the user equipment determines that the quantity of the PMI information is m + 1; wherein N0 is an integral number greater than 0 and less than or equal to 8, and m is an integral number and determined according to a level of feedback precision of the user equipment.
  • N0 is an integral number greater than 0 and less than or equal to 8
  • m is an integral number and determined according to a level of feedback precision of the user equipment.
  • the step of the user equipment determining the quantity of PMI information required to be fed back to a base station according to ⁇ also comprises: when ⁇ is less than N1, the user equipment determining that the quantity of the PMI information is m + 2; wherein N1 is an integral number less than N0 and greater than 0.
  • the PMI information at least comprises first Precoding Matrix Indicator (PMI1) information.
  • the step of the base station acquiring the channel information of the subband according to the PMI information and the RI information comprises: when the quantity of the PMI information determined by the user equipment is 1, the base station seeks out a code word W1 from a first codebook according to the PMI1 information and the RI information, and acquires the channel information of the subband according to the code word W1 and a function F(W1, W2, ..., Wn) of n-1 matrixes, or the base station represents the code word W1 as channel information of the subband; wherein the n-1 matrixes are convention values; n is an integral number; or the base station directly acquires the channel information of the subband according to the code word W1; when the quantity of the PMI information determined by the user equipment is r, the base station seeks out the code word W1 from the first codebook according to the PMI1 information and the RI information, and seeks out
  • function F(W1, W2) comprises W1 ⁇ W2 or W2 X Wl; when r is equal to 3, function F(W1, W2, W3) comprises (W3' * W3) ⁇ W1 ⁇ W2 or W2 X (W3' ⁇ W3 ⁇ W1), wherein W3' denotes a conjugate transpose matrix of W3.
  • the present invention also provides another method for configuring channel information, and the method comprises:
  • the method further comprises: the base station determines the quantity of PMI information required to be fed back by the user equipment according to the rank of channel fed back by the user equipment or polarization configuration information.
  • the base station makes the configuration signaling carried in a Radio Resource Control (RRC) signaling of a high layer channel or a physical downlink control channel (PDCCH) to be transmitted to the user equipment.
  • RRC Radio Resource Control
  • PDCCH physical downlink control channel
  • the present invention also provides a device for acquiring channel information, and the device comprises:
  • the PMI information comprises at least first Precoding Matrix Indicator (PMII) information
  • the acquiring module is configured to acquire the channel information of the subband by the following method: when the quantity of the PMI information determined by the user equipment is 1, seeking out a code word W1 from a first codebook according to the PMI1 information and the RI information; acquiring the channel information of the subband according to the code word W1 and a function F(W1, W2, ..., Wn) of n-1 matrixes, or representing the code word W1 as the channel information of the subband; wherein the n-1 matrixes are convention values, and n is an integral number; or acquiring the channel information of the subband according to the code word W1.
  • PMII Precoding Matrix Indicator
  • the PMI information comprises at least first Precoding Matrix Indicator (PMI1) information
  • the acquiring module is configured to acquire the channel information of the subband by the following method: when the quantity of the PMI information determined by the user equipment is r, seeking out the code word W1 from the first codebook according to the PMI1 information and the RI information, and seeking out r-1 matrixes corresponding to other r-1 PMI information from codebooks corresponding to other r-1 PMI information except the PMI1 information; acquiring the channel information of the subband according to the code word W1 and a function F(W1, W2, ..., Wn) of n-1 matrixes including the r-1 matrixes, wherein other n-r matrixes except the r-1 matrixes in the n-1 matrixes are convention values; or acquiring the channel information of the subband according to the code word W1 and a function f(W1, W2, ..., Wr) of the r-1 matrixes; wherein r is an integral
  • the present invention also provides a device for configuring channel information, and the device includes:
  • the transmitting module is also configured to determine the quantity of PMI information required to be fed back by the user equipment according to the rank of channel fed back by the user equipment or polarization configuration information.
  • the transmitting module is configured to make the configuration signaling carried in a Radio Resource Control (RRC) signaling of a high layer channel or a physical downlink control channel (PDCCH) to be transmitted to the user equipment.
  • RRC Radio Resource Control
  • PDCH physical downlink control channel
  • the technical scheme of the present invention provides a method and device for acquiring the channel information under 8 antennas, and it is able to provide a plurality of feedback precisions, flexibly configure the feedback with different precisions according to specific requirements, and make use of the feedback overhead effectively.
  • the UE feeds back at least one of the rank information (RI) ⁇ of channels, Precoding Matrix Indicator information PMI1 and Precoding Matrix Indicator information PMI2 to PMIn.
  • the UE judges the PMI required to be fed back according to ⁇ or ⁇ and other information.
  • the base station When the UE judges that one PMI needs to be fed back, the UE feeds back PMI1, and the base station seeks out one code word W1 from a first codebook according to RI and PMI1 and regards W2 to Wn as convention values.
  • the base station acquires the channel information of the subband according to F(W1, W2, ..., Wn), or represents the channel information directly by W1.
  • the UE feeds back a plurality of PMI including PMI1, and the base station seeks out one code word W1 from the first codebook according to RI and PMI1.
  • Corresponding matrixes W2 to Wr are found from the corresponding codebooks according to PMI2 to MPIr.
  • Wr+1 to Wn are convention values.
  • the base station acquires the channel information of the subband according to F(W1, W2, ..., Wn).
  • the base station represents the channel information only according to f(W1, W2, ..., Wn).
  • n is an integral number not less than 2, and r is less than or equal to n and greater than or equal to 1.
  • Said convention values can be fixed convention vectors or matrixes; preferably, they can be unit matrixes.
  • Said convention values can also be different convention values according to the rank ( ⁇ ) of RI.
  • Said base station performs the judgment according to ⁇ , and when ⁇ meets a condition of ⁇ ⁇ N0, only m PMI are fed back, and if not, m+1 PMI are fed back; the value of m is determined by other information.
  • N0 can be 2, 3, 4 or 5.
  • the value of m is determined by other information, for example a level of feedback precision of UE.
  • the UE When configured to feed back r PMI, the UE feeds back at least PMI1 and RI information, and the base station seeks out one code word W1 from a first codebook according to RI and PMI1. If r is not equal to 1, the UE still needs to feed back PMI2 to PMIr, and the base station seeks out corresponding matrixes W2 to Wr from corresponding codebooks according to PMI2 to PMIr.
  • Wr+1 to Wn are convention values, and the base station acquires the channel information of the subband according to F(W1, W2, ..., Wn).
  • the base station acquires the channel information according to f(W1, W2, ..., Wn).
  • W1 represents the channel information directly.
  • said convention values can be fixed convention vectors or matrixes
  • said convention values can also be different convention values according to different RI.
  • the configuration signaling sent by the base station is carried in a physical downlink control channel (PDCCH); preferably, the configuration signaling sent by the base station is carried in a Radio Resource Control (RRC) signaling of a high layer channel.
  • PDCCH physical downlink control channel
  • RRC Radio Resource Control
  • the base station configures the value of r according to the RI information.
  • the base station configures the value of r according to polarization information.
  • the UE acquires the Rank indicator (RI) information of a current channel, acquires the rank ( ⁇ ) of the current channel from the RI information, and determines the quantity of PMI required to be fed back to the base station according to ⁇ .
  • RI Rank indicator
  • ⁇ rank
  • the UE When ⁇ is greater than or equal to N0, the UE feeds back m Precoding Matrix Indicator (PMI) information and the RI; when ⁇ is less than N0, the UE feeds back m+1 Precoding Matrix Indicator (PMI) information and the RI; wherein m is determined according to information such as the level of feedback precision of the UE and the like, and N0 is an integral number greater than 0 and less than or equal to 8, for example 2, 3, 4, 5 and so on.
  • PMI Precoding Matrix Indicator
  • the UE feeds back the first Precoding Matrix Indicator (PMI1) information, and the base station seeks out one code word W1 (or called matrix W1) from the first codebook according to RI and PMI1, and other matrixes W2 to Wn are convention values, wherein n is an integral number not less than 2.
  • the base station acquires the channel information of the subband, or represents W1 directly as the channel information.
  • the UE feeds back a plurality of PMI including PMI1, and the base station seeks out one code word W1 from the first codebook according to RI and PMI1, and seeks out corresponding matrixes W2 to Wr (r is less than or equal to n and greater than or equal to 2) from the corresponding codebooks according to PMI2 to MPIr, and other matrixes Wr+1 to Wn are convention values.
  • the base station acquires the channel information of the subband according to the function F(W1, W2, ..., Wn) of all n code words W1, W2, ..., and Wn, or acquires the channel information of the subband only according to a function f(W1, W2, ..., Wn) of r code words W1, W2, ..., and Wr.
  • Said convention values can be fixed convention vectors or matrixes; and preferably, they can be unit matrixes.
  • Said convention values can also be different convention values according to ⁇ .
  • the base station sends a configuration signaling, and the configuration signaling is used for configuring x ones of the Precoding Matrix Indicator information PMI1 to PMIn required to be fed back by the UE, identified by PMI1 to PMIx respectively, wherein x is greater than or equal to 1 and less than or equal to n, and n is an integral number not less than 2.
  • the UE feeds back x Precoding Matrix Indicator information PMI1 to PMIx and the Rank Indicator (RI) information of the current channel to the base station.
  • the x PMI information at least feed back the first Precoding Matrix Indicator (PMI1) information.
  • PMI1 information the base station seeks out one code word W1 from a first codebook according to the RI information and PMI1 information. If x is not equal to 1, the UE also needs to feed back the second Precoding Matrix Indicator (PMI2) information, the third Precoding Matrix Indicator (PMI3) information, ..., until the xth Precoding Matrix Indicator (PMIx) information, and the base station seeks out corresponding matrixes W2 to Wx from the corresponding codebooks according to PMI2 to MPIx. Wr+1 to Wn are convention values.
  • the base station acquires the channel information of the subband according to the function F(W1, W2, hence, Wn) ofn PMI information W1, W2, whil, Wn; alternatively, the base station acquires channel information of the subband according to the function f(W1, W2, whil, Wx) ofx PMI information W1, W2, whil, Wx.
  • W1 can directly represent the channel information of the subband.
  • Said convention values can be fixed convention vectors or matrixes, and preferably said convention values can be different convention values according to ⁇ .
  • the configuration signaling sent by the base station is carried in a physical downlink control channel (PDCCH), and can also be carried in a Radio Resource Control (RRC) signaling of a high layer channel.
  • PDCCH physical downlink control channel
  • RRC Radio Resource Control
  • the base station can determine the quantity x according to the RI information, and can also configure the quantity x according to the polarization information.
  • Embodiment one illustrates a method for acquiring channel information, and as shown in FIG. 1 , it mainly includes the following steps:
  • Embodiment two illustrates a method for acquiring channel information, and as shown in FIG. 2 , it mainly includes the following steps:
  • Embodiment three illustrates a method for acquiring channel information, in which a part of steps are in accordance with the ones of the foregoing embodiment one, and the major difference from embodiment one lies in that:
  • Embodiment four illustrates a method for acquiring channel information, in which a part of steps are in accordance with the ones of the foregoing embodiment one, and the major difference from embodiment one lies in that:
  • Embodiment five illustrates a method for acquiring channel information, and as shown in FIG. 3 , the configuration method mainly includes the following steps:
  • Embodiment six illustrates a method for acquiring channel information, and as shown in FIG. 4 , the configuration method mainly includes the following steps:
  • Embodiment seven illustrates a method for acquiring channel information, in which a part of steps are in accordance with ones of the foregoing embodiment five, and the major difference from embodiment five lies in that:
  • the base station can make the configuration signaling carried in a Radio Resource Control (RRC) signaling of a high layer channel to be transmitted to the UE.
  • RRC Radio Resource Control
  • the RRC signaling is a signaling defined in LTE, and still used in LTE-A. For some channels that RI has not changed for a long time, making them carried in the high layer signaling can reduce a configuration overhead.
  • the base station can make the configuration signaling carried in a physical downlink control channel (PDCCH) of a physical layer to be transmitted to the UE.
  • the PDCCH channel is a downlink control channel defined by the physical layer in LTE, and there is also a corresponding physical downlink control channel in LTE-A.
  • making them carried in physical layer signaling can well configure the quantity of PMI fed back according to the value of RI.
  • Embodiment seven illustrates a device for acquiring the channel information, and the device includes:
  • the acquiring module is configured to acquire the channel information of the subband by the following method: when the quantity of PMI information determined by the user equipment is 1, seeking out a code word W1 from a first codebook according to the PMI1 information and RI information; acquiring the channel information of the subband according to the code word W1 and a function F(W1, W2, ..., Wn) of n-1 matrixes, or representing the code word W1 as channel information of the subband; wherein the n-1 matrixes are convention values, and n is an integral number; or acquiring the channel information of the subband according to the code word W1.
  • the acquiring module is configured to acquire channel information of the subband by the following method: when the quantity of the PMI information determined by the user equipment is r, seeking out the code word W1 from the first codebook according to the PMI1 information and RI information, and seeking out corresponding r-1 matrixes from corresponding codebooks according to other r-1 PMI information except the PMI1 information in r PMI information; acquiring the channel information of the subband according to the code word W1 and a function F(W1, W2, ..., Wn) of n-1 matrixes, wherein other n-r matrixes except the r-1 matrixes in the n-1 matrixes are convention values; or acquiring the channel information of the subband according to the code word W1 and the function f(W1, W2, ..., Wn) of the r-1 matrixes, wherein r is an integral number greater than or equal to 2.
  • Embodiment eight illustrates a device for configuring the channel information, and the device includes:
  • the transmitting module is also configured to determine the quantity of PMI information required to be fed back by the user equipment according to the rank of channel fed back by the user equipment or polarization configuration information.
  • the transmitting module is configured to make the configuration signaling carried in a Radio Resource Control (RRC) signaling of a high layer channel or a physical downlink control channel (PDCCH) to be transmitted to the user equipment.
  • RRC Radio Resource Control
  • PDCH physical downlink control channel
  • modules or steps of the present invention can be implemented by using a general-purpose computing device, and they can be integrated in a single computing device or distributed over a network composed of multiple computing devices; optionally, they can be implemented by using computing device executable program codes, thus, they can be stored in a storage device for being executed by the computing device, or they can be made into various integrated circuit modules respectively, or multiple modules or steps therein are made into a single integrated circuit module for implementation. In this way, the present invention is not limited to any particular combination of hardware and software.

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BR112012027015B1 (pt) 2021-10-19
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